It’s actually incredible how they are able to do this. So I hear (just a conspiracy theory), that what Disney does is set an attendance amount of people who would be able to attend each night… then they SELL these tickets to people with promises of exclusive shows, merchandise, food, etc. Then people exchange their money for a “ticket” to this event. This “ticket” allows them to enter the event, ride the rides and do the party stuff. Once they have sold a certain number of these “tickets”, they STOP selling them which further increases demand as people want to be one of these lucky few with “tickets” to an exclusive “event”. Pretty shady stuff if I don’t say so myself. I know most other theme parks would not do this luckily.